13625621 has 4 divisors (see below), whose sum is σ = 14095500. Its totient is φ = 13155744.

The previous prime is 13625617. The next prime is 13625639. The reversal of 13625621 is 12652631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12652631 = 37 ⋅341963.

It can be written as a sum of positive squares in 2 ways, for example, as 7623121 + 6002500 = 2761^2 + 2450^2 .

It is a cyclic number.

It is not a de Polignac number, because 13625621 - 2² = 13625617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13628621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234896 + ... + 234953.

It is an arithmetic number, because the mean of its divisors is an integer number (3523875).

Almost surely, 2^13625621 is an apocalyptic number.

It is an amenable number.

13625621 is a deficient number, since it is larger than the sum of its proper divisors (469879).

13625621 is an equidigital number, since it uses as much as digits as its factorization.

13625621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469878.

The product of its digits is 2160, while the sum is 26.

The square root of 13625621 is about 3691.2898829542. The cubic root of 13625621 is about 238.8464376543.

The spelling of 13625621 in words is "thirteen million, six hundred twenty-five thousand, six hundred twenty-one".